CMH Pub 10-17 The Signal Corps: The Test (December 1941 to July 1943) by George Raynor Thompson, Dixie R. Harris, Pauline M. Oakes, and Dulany Terrett.
"The scope of this, the second Volume devoted to the history of the Signal Corps during World War II, covers the events of 1942 and the first six months of 1943. Like the first volume in the subseries, The Emergency, by Dr. Dulany Terrett, this book presents a broad, panoramic view of the progress and problems, the defeats and triumphs, of a technical service in wartime. Since the time span covers only eighteen months, it has been possible to examine certain operations in considerable detail. Such emphasis on particular matters should not be taken to mean that they are necessarily more important than others which are touched upon lightly or omitted altogether, but only that they are illustrative or typical of the three main streams of Signal Corps effort. Research and development, training, and supply each swelled so quickly to proportions so vast that they almost engulfed the Signal Corps in the first year of war. How the Corps met the test is the subject matter of this volume."